| 引用本文: | 张白,陈俊,杨鸥,朱虹,龙士国.试件尺寸对锈蚀钢筋与混凝土间黏结性能的影响[J].哈尔滨工业大学学报,2018,50(12):89.DOI:10.11918/j.issn.0367-6234.201803017 |
| ZHANG Bai,CHEN Jun,YANG Ou,ZHU Hong,LONG Shiguo.Influence of specimen size on bond performance between corroded reinforcing steel bars and concrete[J].Journal of Harbin Institute of Technology,2018,50(12):89.DOI:10.11918/j.issn.0367-6234.201803017 |
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| 试件尺寸对锈蚀钢筋与混凝土间黏结性能的影响 |
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张白1,2,陈俊1,杨鸥3,朱虹2,龙士国1
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(1.湘潭大学 土木工程与力学学院,湖南 湘潭 411105; 2.东南大学 土木工程学院,南京 211189; 3.湖南大学 土木工程学院,长沙 410082)
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| 摘要: |
| 为研究试件尺寸（立方体试件边长为10D,钢筋直径D=14、20、25 mm）对锈蚀钢筋与混凝土间黏结性能的影响,通过电化学加速锈蚀方法,获得了7组不同钢筋锈蚀率（0%、0.5%、1.0%、2.0%、5.0%、8.0%、10.0%）的中心拉拔试件.分析了试件尺寸、锈蚀率等影响因子作用下钢筋与混凝土间黏结性能的变化规律.结果表明:随着锈蚀率的增加,试件尺寸越大其锈胀裂纹出现越早且最大锈胀裂纹越宽；各试件的黏结强度、黏结刚度均随混凝土的恶化及锈蚀率的增加呈现出先增长后逐渐削减的趋势,黏结能量则随锈蚀率的增加而逐渐下降,且较大尺寸试件（D=25 mm）的黏结性能受锈蚀率的影响更为显著；锈胀裂纹出现前,试件自由端峰值滑移、黏结能量下降较为缓慢；当锈胀裂纹出现后,其自由端峰值滑移、黏结能量急剧下降,而后随着锈胀裂纹的加宽,其下降速率趋于平缓.基于试验结果,建立了不同锈蚀率下残余黏结应力与试件尺寸的关系式. |
| 关键词: 黏结性能 锈蚀钢筋 混凝土 试件尺寸 锈胀裂纹 |
| DOI：10.11918/j.issn.0367-6234.201803017 |
| 分类号:TU375.4 |
| 文献标识码:A |
| 基金项目:国家自然科学基金面上项目(51578229)； 湖南省科技重大项目(2017SK1010); 湘潭大学博士启动基金 |
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| Influence of specimen size on bond performance between corroded reinforcing steel bars and concrete |
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ZHANG Bai1,2,CHEN Jun1,YANG Ou3,ZHU Hong2,LONG Shiguo1
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(1.College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China; 2.School of Civil Engineering, Southeast University, Nanjing 211189, China; 3.College of Civil Engineering, Hunan University, Changsha 410082, China)
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| Abstract: |
| To investigate the influence of specimen size on bond performance between corroded reinforcing steel bars and concrete, three cube specimens of different dimensions were cast with 10D length per side, where D is the diameter of longitudinal rebars (D=14 mm,20 mm,25 mm). Pull-out specimens with reinforcement mass loss percentage of 0%, 0.5%, 1.0%, 2.0%, 5.0%, 8.0%, and 10.0% were obtained using current accelerated method. The variation laws of bond characteristics were analyzed considering the influence of reinforcement corrosion ratio and specimen size. The experimental results show that the expansive cracks appeared earlier and the maximum crack width was larger as the dimensions of specimens increased. The bond strength and the initial bond stiffness first increased and then gradually decreased as the concrete deterioration and reinforcement corrosion levels increased for specimens of different dimensions, and the bond energy dissipation decreased as the mass loss of reinforcement increased, whereas the specimen with larger diameter (D=25 mm) was more sensitive to the corrosion than that of the specimen with smaller diameter (D=14 mm, 20 mm). Moreover, the free-end slip and the bond energy dissipation for specimens of different dimensions decreased slowly before the corrosion-induced cracks appeared, and then decreased rapidly when the corrosion-induced cracks appeared, which had no significant effects on corrosion level after the corrosion-induced cracks appeared. Based on the experimental results, the empirical model of the residual bond stress between corroded rebar and concrete was proposed, which can evaluate the residual bond strength with different diameter of reinforcement. |
| Key words: bond performance corroded steel bar concrete specimen size corrosion-induced cracks |
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